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《Journal of Vibration and Shock》 2015-04
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Longitudinal guided waves in pipes excited by non-axisymmetric multielement surface loading

MA Shu-yi;WU Zhan-jun;LIU Ke-hai;WANG Yi-shou;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology;  
Axisymmetric surface loading is an effective method to excite axisymmetric guided waves in pipes.However,non-axisymmetric surface loading appears due to various influence factors,such as,transducer installation error and it leads to the complex excited guided wave modes. Here,longitudinal guided waves excited by non-axisymmetric multielement surface loading were investigated deeply. Two typical non-axisymmetric loadings were considered and analyzed. Based on the normal modal expansion technology,the quantitative relationship between applied boundary loadings and guided wave excitation acoustic field was built,and then the generation mechanism of individual guided wave was analyzed and the effects of non-axisymmetric loading array on the generation of longitudinal guided wave were studied.Theoretical predictions were verified with the finite element simulations. For the non-axisymmetric surface loading occurring in the actual pipe inspection,a new loading compensation strategy was proposed and verified with tests. The results showed that the compensation strategy can suppress the flexural modes effectively,and is helpful to improving the noise level of guided wave signals.
【Fund】: 国家科技重大专项(2008ZX05026);; 国家自然科学基金(91016024);; 教育部新世纪人才(NCET-11-0055);; 中央高校基本科研业务费(DUT12LK33)
【CateGory Index】: TG115.285
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